Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!atha!aunro!edm!geoff
From: geoff@edm.uucp (Geoff Coleman)
Newsgroups: comp.unix.aix
Subject: Re: Paging Space allocation of RS6000
Keywords: Paging space, /usr
Message-ID: <1991Apr16.194753.26660@edm.uucp>
Date: 16 Apr 91 19:47:53 GMT
References: <1991Apr16.041508.12953@cmcl2.nyu.edu> <6699@awdprime.UUCP>
Distribution: comp.unix.aix
Organization: Unexsys Systems Inc
Lines: 45

In article <6699@awdprime.UUCP> julie@levell.austin.ibm.com (Julie A. Levell) writes:
>In article <1991Apr16.041508.12953@cmcl2.nyu.edu> lixj@acf4.nyu.edu (Xiaojian Li) writes:
>>disk hdisk0 has been partitioned into / /usr /tmp. We have about 100MB
>>free on /usr, so we decided to free it up and get a partition out of it.
>>But I CAN NOT EVEN UMOUNT IT!
>>
	You have to turn off the error daemon before you can unmount /usr!


>>Is there any crucial file on /usr that it is not allowed to be touched?
>>What will happen if I don't have /usr filesystem? (that needs to be the
>>case, I may backup entire /usr, then distroy it, repartition, then restore).
>
>Well, usually the reason it won't let you unmount it is because /usr
>contains the messages, so if you have your LANG variable set to
>En_US then it has the catalogs in /usr/lpp/msg/En_US open.  
	
	Unless these are in active use the O/S shouldn't care !!!

>
>Also, if you don't have a /usr then you could run into problems in 
>booting because /usr/lpp/fonts contains the fonts for the hft and
>/usr/bin/odmget is used at boot time to determine what the key 
>position is that tells diagnostics to run or not.  We've seen this problem
>before and it usually leads to a c99 in the LED.  
>
>I would recommend shutdown -m after you've changed your LANG variable.
>
>>Xiaojian 
>

	Why is odmget in /usr if it is necessary to the booting of the machine
AIX must be the only UNIX where you need to have /usr accessible in order
to boot it. The explanation from IBM was that they were add ons to the OS
so they should be in /usr (I believe there are more O/S critical files
than just odmget in /usr). 

Geoff Coleman

>
>-- 
>*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
>Julie A. Levell  IBM  Austin, Texas      Internet: julie@aixwiz.austin.ibm.com
>IBMNET: JULIEL at AUSVMQ 4C-29/994       SpeakNet:  823-5178 (Tie 793-5178)
>"Let's use the ODM Interface"  Commander William Riker  STTNG  "The Nth Degree"